Nursery and 15 month old

Hi
I am wanting to start my little boy in nursery just 2 half days but he hates strangers! We go to playgroup and he loves it but will not leave my side. He will smile and wave at strangers out of the house but if they come into my house or his nanas house he just cried! I don’t know if putting him in nursery will help with this or to leave him a bit longer before trying him with nursery? X